JPH08262559A - Camera - Google Patents

Abstract

PURPOSE: To prevent damage to a film when the film passes through the corner part of a guiding part for leading the film to a feeding path in a camera loaded with a film cartridge housing a photographic film up to its end part in the case body of the cartridge. CONSTITUTION: The guiding part 33 which leads the top end of the photographic film 8 fed from the film feeding port of the film cartridge 2 to a film feeding path 32 and has at least an end part guiding surface 51 on the side of a camera body 20 is provided on one end side of the film feeding path 32. Also, a part of the guiding part 33 including the corner part 54 for connecting the end part guiding surface 51 on the side of the camera 20 to a plane surface 53 on the side of a film exposure frame 29 successive to the guiding surface 51 is composed of a gate member 45 having a smooth surface of a resin material not including different fiber from that of the camera 20 made of fiber reinforced resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a camera in which a cartridge body is loaded with a cartridge which is wound around a spool up to the leading end of a photographic film and accommodated therein.

[0002]

2. Description of the Related Art Conventionally, in a general camera, a photographic film, which is stored in a metal plate patrone with the film tip portion left, is loaded and used. As disclosed in Kaihei 6-110124, a camera using a thrust type film cartridge has been proposed.

As illustrated in FIG. 6, the film cartridge 2 used in the camera of the present invention has a spool 6 provided inside a cartridge body 3 formed by joining divided cases made of a resin molded product. The tip part is also wound and stored in a roll shape.
A slit-shaped film delivery port 10 is formed on the side surface of the cartridge body 3, and a lid member 11 for opening and closing the delivery port 10 is rotatably supported inside the film delivery port 10. The lid member 11 is rotatably provided in parallel with the spool 6, and a key 12 is provided at one end of the lid member 11. The key 12 is exposed on the end surface of the cartridge body 3 to engage the lid opening member with the key 12 from the outside. The lid member 11 can be rotated between a position where the film outlet 10 is opened and a position where the film outlet 10 is closed by rotating the lid member 11 by rotating the lid member 11 with the position.

On the other hand, both ends of the spool 6 are exposed to the end surface of the cartridge body 3, and a key 14 is provided at the end portion thereof, and the key 14 is engaged with a drive mechanism (fork 28 in FIG. 2 described later) on the camera side. Then, the film is unwound and rewound.

Further, as shown in FIG. 7, the photographic film 8 sent out from the film cartridge 2 is passed through a film feeding path 32 provided between a camera body 30 (film exposure frame) and a pressure plate 31. When the film is fed to the film winding chamber on the opposite side, the leading end of the photographic film 8 fed from the film feeding port 10 of the cartridge 2 is attached to one end of the film feeding passage 32.
There has also been proposed a structure in which the guide portion 50 is formed by the guide surfaces 51 and 52 that lead to the. The guide portion 50 is formed of an end guide surface 51 on the camera body 30 side and an end guide surface 52 on the pressure plate 31 side, and the leading end of the film 8 collides with the guide surface 51 of the camera body 30 when exiting from the cartridge 2. Guided by the guide surface 51, the film is inserted into the film feeding path 32 in the gap between the two.

On the other hand, in order to reduce the size of the camera, it is effective to reduce the thickness of each part of the camera body 30, but for the purpose of improving the reduction in strength and weakening due to the reduction in thickness, A fiber reinforced resin mixed with a fiber material such as glass fiber is often used as a material forming the camera body. By adopting this fiber reinforced resin, the strength of the member can be improved and the wall thickness of the molded product can be reduced, which is very useful for downsizing the camera body.

[0007]

However, in the photographic film guiding structure as described above, when the photographic film 8 is guided from the guide portion 50 to the film feeding path 32, the film surface may be scratched. is there.

Specifically, as shown in FIGS. 8 and 9, the property of the film 8 when passing through the guide portion 50 is that the guide surface 51 of the guide portion 50 is between the pressure plate 31 and the camera body 30. And a connection corner 54 between the exposure frame side flat surface 53 and the photographic film 8. Inner rails 30a are formed above and below the film feed path 32 along the moving direction of the film, and the curling of the photographic film 8 causes the film 8 to wave between the pressure plate 31 and the camera body 30 as shown in the figure. Hit and run, the surface of the film 8 is the camera body 3
Due to the edge of the inner rail 30a at the connection corner 54 on the 0 side, the surface of the photographic film 8 has linear scratches A, that is, the emulsion coated on the film surface, as shown in FIG. May be

Particularly, in the case where the connection corner portion 54 is formed of the fiber reinforced resin as described above, the film is likely to be scratched by the contact of the fiber material exposed on the surface of the component. Emulsion scraps scraped by the scratches adhere to the surface of the film or enter the inside of the film cartridge 2 at the time of rewinding and adhere to various parts, which deteriorates the quality of the photographed image and adheres to the magnetic head. There is a risk that dropout will occur when writing magnetic information.

It is considered that this phenomenon occurs when the surface of the contact portion of the camera body is not smooth and rough, or when the fibrous material exposed on the plastic surface damages the film. Especially in the latter case, in a camera that feeds a lot of film, the fibers gradually come out to the surface even if the fibers do not appear on the surface at the time of molding, as the contact portion gradually wears. Can damage the film.

Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a camera capable of preventing the film from being scratched due to the contact with the corner portion of the camera body. It is a thing.

[0012]

In the camera of the present invention for achieving the above object, the leading end of the photographic film fed from the film feed opening of the film cartridge is provided at one end of the film feeding path as the film feeding path. A guide portion having at least an end guide surface on the camera body side to be guided is provided, and a part of the guide portion including a connection corner portion between the end guide surface of the guide portion on the camera body side and the extension plane of the film exposure frame is provided. It is characterized in that it is constituted by a gate member having a smooth surface made of a resin material which does not contain another fiber and a material for forming a camera body which is formed by a fiber reinforced resin mixed with a fiber material.

At least the surface of the gate member is preferably made of a low friction material. On the other hand, in the connection portion on the film exposure frame side between the gate member and the camera body, the height of the connection portion on the camera body side is set to be equal to or lower than the height of the connection end portion of the gate member, and the film front end in the film feeding direction. It is preferable that the locking projection is not locked.

[0014]

According to the present invention, when the front end of the photographic film is sent out from the film delivery port from the film cartridge loaded in the camera, the front end is guided to the guide surface of the guide portion and is located between the camera body and the pressure plate. When the film is fed into the film feeding path, the film comes into contact with the connection corner portion of the guide portion, and a part of the guide portion including the connection corner portion contains a fiber different from the camera body made of fiber reinforced resin. It is composed of a gate member with a smooth surface made of a non-resin material, no fibrous material is exposed, the emulsion on the film surface is not scraped by the contact, and various types of emulsion debris are attached. The harmful effects of can be avoided in advance.

Further, since the camera body other than the gate member can be made of fiber reinforced resin mixed with fiber material, the camera can be made compact and lightweight, and the film can be fed and run during rewinding. The resistance is reduced and the driving force can be reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 showing the internal structure of the camera,
The camera body 20 includes an exposure unit 23 in which a taking lens 21 and a shutter are incorporated in a central portion, and a cartridge storage chamber 24 on both sides with the exposure unit 23 interposed therebetween.
And a film winding chamber 25 are provided respectively. The exposure unit 23 is provided so as to be movable in the optical axis direction of the taking lens 21.
It is stored within the 0 contour.

The film cartridge 2 is loaded into the cartridge storage chamber 24 by opening and closing the bottom cover 26 provided on the bottom surface of the camera body 20. With that loading,
The spool 6 is fitted into a fork 28 (driving mechanism) protruding above the cartridge storage chamber 24, and the cartridge storage chamber 24 is vertically positioned. Further, a lid opening member (not shown) that engages with the key 12 of the lid member 11 to open and close the lid member 11 is provided.

An exposure frame 29 integrally formed as the camera body 20 and a pressure plate 31 attached to the back cover are provided on the back side of the exposure unit 23.
A film feeding path 32 that connects the cartridge storage chamber 24 and the film winding chamber 25 is formed between the exposure frame 29 and the pressure plate 31. At the end of the film feeding path 32 on the side of the cartridge storage chamber 24, a guide portion 33 for guiding the leading end of the photographic film 8 fed from the cartridge body 3 to the film feeding path 32 is provided with the film feeding port 10 of the film cartridge 2. It is formed to face. As shown in FIG. 2, a finder 34 and a light projecting portion 35 of the AF unit are provided above the exposure unit 23.
a and the light receiving portion 35b are arranged.

In the film winding chamber 25, the motor 3
Winding shaft 37 driven by 6 and this winding shaft 37
Film 8 fed from the film feed path 32 to the
Is provided with two film guide plates 38 and 39 for pressing and locking the tip of the. The motor 36 rotates the fork 28 (driving mechanism) by a gear or the like to feed and rewind the photographic film 8. A light emitting unit 40, a strobe capacitor 42, a battery 43, and a strobe substrate (not shown) are incorporated on the right side of the film winding chamber 25.

FIG. 3 is an enlarged view of the guide portion 33. The guide portion 33 includes a guide surface 51 formed on the camera body 20 side and a guide surface 52 formed on the film pressure plate 31 side. The leading end of the photographic film 8 delivered from the film delivery port 10 of the film cartridge 2 is guided by the guide surfaces 51 and 52 to the film feeding path 32.
The end guide surface 51 of the guide portion 33.
And a part of the guide portion 33 including the connection corner portion 54 between the exposure plane 29 and the extension plane 53 of the exposure frame 29 is formed as a part different from the camera body 20 and formed of a gate member 45 having a smooth surface made of a different material. The guide surfaces 51 and 52 are formed as inclined flat surfaces or curved surfaces.

FIG. 4 shows the camera body 20 with the pressure plate 31 removed, and an exposure frame 29 is provided so as to cover the periphery of the opening at the back of the exposure unit 23, and the exposure frame 29 extends laterally above and below. The inner rail 29a is arranged. The inner rail 29a serves as the guide portion 3 of the gate member 45.
3 extends to the guide surface 51. As described above, the surface of the inner rail 29a of the gate member 45 including the corner portion 54 is formed into a smooth surface that does not scratch the surface of the photographic film 8. Furthermore, this gate member 4
It is preferable that the surface of No. 5 is made of a material having a small frictional resistance.

The camera body 20 is made of, for example, a fiber reinforced resin in which a fiber material such as glass fiber or carbon fiber is mixed in a polycarbonate resin, and the gate member 45 is a polycarbonate resin or a polyacetal in which the above fiber is not mixed. It is made of resin. The polyacetal resin is a material having excellent lubricity. In addition, as a material for forming the gate member 45, a metal material or a resin molded product having a lubricity coating on its surface can be applied. The surface portion of the gate member 45 has a hardness that exhibits abrasion resistance against contact with the photographic film 8, has small surface irregularities and is smooth, and is provided so as not to scrape off the emulsion or the like of the photographic film 8. .

The gate member 45 is fixed to the camera body 20 by tightening and fixing by applying a fixing screw 46 as shown in the drawing, or by joining and fixing by using an adhesive.

Further, FIG. 5 is an enlarged view of the structure of the connecting portion between the gate member 45 and the camera body 20, showing the plane portion 53 of the gate member 45 and the plane portion 53 of the camera body 20, especially the inner rail 29a. A step portion and a protrusion are formed in the connecting portion so that the leading end portion of the photographic film 8 is locked so that the feeding of the photographic film 8 is not hindered. That is, in order to prevent the height of the connecting end of the camera body 20 from becoming higher than the height of the connecting end of the flat portion of the gate member 45, the slope 47 is formed at the connecting end of the camera body 20 to make it slightly higher. I try to absorb the fluctuation of the height. In addition, this slope 4
It is preferable that chamfering or the like is performed so that a corner portion that may damage the film 8 due to the formation of 7 is not formed.

To explain the operation of the above embodiment, when the film cartridge 2 is loaded in the cartridge storage chamber 24 and the bottom lid 26 is closed, the camera control unit drives the lid opening member to rotate the lid member 11. Then, the film delivery port 10 is opened. After that, the control unit rotates the motor 36 to rotate the fork 2
When the spool 6 is driven to rotate in the feeding direction, the leading end of the photographic film 8 is fed out of the cartridge body 3 through the film feeding port 10. This photographic film 8
Is slightly curled so that the front end faces the camera body 20 side, the front end is guided by the guide portion 33 on the camera body 20 side.
It abuts the guide surface 51 of the gate member 45.

The leading end of the photographic film 8 has the guide surface 51.
And is guided smoothly to the film feed path 32 without being clogged or bent at the guide portion 33. The leading edge of the photographic film 8 is the film feeding path 3
When the photographic film 8 is sent from the film winding chamber 25 to the film winding chamber 25, the photographic film 8 is pressed by the film guides 38 and 39 and wound on the rotating winding shaft 37. After that, when the driving of the fork 28 is stopped, the photographic film 8 is wound up by the winding shaft 37. Then, when the first frame is set in the exposure frame 29 of the camera body 20, the rotation of the winding shaft 37 is stopped and the winding of the photographic film 8 is stopped. Subsequent operations are performed in the same manner as a general camera, and thus the description thereof will be omitted.

In the delivery of the photographic film 8 as described above, even if the surface of the photographic film 8 comes into contact with the connection corner portion 54 of the gate member 45, the surface is smooth and the reinforcing glass fiber or the like is not projected. Also, it is possible to prevent the emulsion on the film surface from being scraped off and scratched, and to prevent various adverse effects due to the quality of the photographed image and the generation of powder.

The guide portion 33 may be constituted only by the guide surface 51 on the camera body side.

[0029]

According to the present invention, the film from the film cartridge is loaded in such a manner that the leading end portion of the photographic film is wound on the spool and accommodated in the cartridge body. Do not scratch the film surface of a part of the guide member including the connection corners because the connection corners may cause damage to the photographic film due to the formation of the guide parts so that the feeding can be performed smoothly. By being composed of a gate member made of a resin material that does not contain another fiber,
It is possible to prevent damages on the film surface and adverse effects caused by shavings, and the material forming the camera body can be fiber reinforced resin that emphasizes its strength, and the camera can be made lightweight and compact as a whole. It is a thing.

[Brief description of drawings]

FIG. 1 is an internal cross-sectional view of a camera according to an embodiment of the present invention as seen from above.

FIG. 2 is an internal cross-sectional view of the same camera seen from the front side.

FIG. 3 is a cross-sectional plan view of essential parts showing a part of a film feeding path from a guide part of the camera.

FIG. 4 is a perspective view from the back side of the camera with the back cover removed.

5 is an enlarged view of the camera body in FIG.

FIG. 6 is a perspective view showing a film cartridge used in the camera of the present invention.

FIG. 7 is a cross-sectional view showing a structure of a film guide portion in a conventional example.

8 is an explanatory view showing a film guide state in the example of FIG.

FIG. 9 is a sectional view of FIG. 8;

10 is a front view showing an example of occurrence of scratches on the photographic film in the example of FIG.

[Explanation of symbols]

 2 film cartridge 3 cartridge body 6 spool 8 photographic film 10 film delivery port 11 lid member 20 camera body 29 exposure frame 29a inner rail 31 pressure plate 32 film feeding path 33 guide section 45 gate member 47 slope 51, 52 guide surface 53 plane 54 Corner

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[Procedure amendment]

[Submission date] March 19, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

The leading end of the photographic film 8 has the guide surface 51.
And is guided smoothly to the film feed path 32 without being clogged or bent at the guide portion 33. The leading edge of the photographic film 8 is the film feeding path 3
When the photographic film 8 is sent from the film winding chamber 25 to the film winding chamber 25, the photographic film 8 is pressed by the film guides 38 and 39 and wound on the rotating winding shaft 37. After this, the winding shaft 3 is more than the film feeding amount by the fork 28.
The amount of winding by 7 becomes larger, and the photographic film 8 is wound up by the winding shaft 37. Then, when the first frame is set in the exposure frame 29 of the camera body 20, the rotation of the winding shaft 37 is stopped and the winding of the photographic film 8 is stopped. Subsequent operations are performed in the same manner as a general camera, and thus the description thereof is omitted.

Claims (4)

[Claims] 1. A film cartridge in which a spool is wound up to the leading end of a photographic film and stored therein is loaded in the cartridge body, and the spool is rotated by a driving mechanism of a camera so that the leading end of the stored photographic film is held in the cartridge body. In a camera adapted to feed out from a formed film feeding port and feed it into a film winding chamber through a film feeding path provided between a film exposure frame of a camera body and a pressure plate, A guide part having at least an end guide surface on the camera body side for guiding the leading end of the photographic film sent out from the film delivery port to the film feeding path, on one end side of the camera body, and an end of the guide part on the camera body side. Part of the guide part including the connection corner part between the part guide surface and the extension plane of the film exposure frame,
A camera characterized in that the camera body is made of a fiber-reinforced resin mixed with a fiber material, and a gate member having a smooth surface made of a resin material which does not contain another fiber and a molding material of the camera body. 2. The camera according to claim 1, wherein at least a surface of the gate member is made of a low friction material. 3. The camera according to claim 1, wherein the guide portion is formed by an end guide surface on the camera body side and an end guide surface on the pressure plate side. 4. A film exposure frame-side connection portion between the gate member and the camera body, the height of the connection portion on the camera body side is set to be equal to or lower than the height of the connection end portion of the gate member, 2. The camera according to claim 1, wherein a projection for locking the leading end of the film is not formed.